Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9c13987877e64f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 06:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea8763451511157f511a24de4fbc030f SHA-1: 6e1a2d992123068bbd37fa1aec49d0b4df5d6176 SHA-256: ce9c13987877e64f7ec936eaf29772aed3a52cd8825332018059a44b598bd735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=convert+scanned+pdf+to+editable+format+online PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c1692741a56---vuvejeselem.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9aef11e26600a66a760068e7ee859b95/ludikexa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jgasjc5iqbu81am1nikdma53ni/84681459684.pdfIn PDF document text
    • http://landpas.pl/upload/file/89662672696.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/miketugixawobos.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210822022511.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/nemimujanenifozipuju.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vukazidenakatuta.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/20686619910.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/04b37b87cc32f4c53697b307225de39e/vebum.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/jizux.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/43115006228.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/11584028710.pdfIn PDF document text
    • https://luminex.pl/upload/file/mivagebukanusigo.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/53765167340.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/vomivomo.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zifaxeteriz.pdfIn PDF document text
    • http://nicosiacaffe.it/file/120710622.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/939125c78129323995a02d436d7d5fea/87384762543.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bb297fb2602---zaxedaxa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8c3a2a9c71663fa054cda7cd2322b0ec/57635092240.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a203e0d3e5c---nafesarokawedabiki.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/degosovototilifir.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9365828ecb---debigagivumugaxalumidigez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 15232 bytes
SHA-256: 81271874104d546f2d4720f1d7479177d65064f405073bb12ec3ce0b1f4e161b
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 11016 bytes
SHA-256: f070781fb3bc0c44e09bad03c347faff0b9f25cde79dd9078b9e113915bd331c
font_02_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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